Transcript Probability and 2-Factor Notes

2-Factor Punnett Square
Notes
2-Factor Punnett Square Notes
1-3
1234
1234
1-4
BBTt x bbTt
2-3
bT
bt
bT
2-4
bt
BT
BbTT
BbTt
BbTT
BbTt
Bt
BbTt
Bbtt
BbTt
Bbtt
BT
BbTT
BbTt
BbTT
BbTt
Bt
BbTt
Bbtt
BbTt
Bbtt
Ratios
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Genotypic Ratio:
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BBTT: BBTt: BbTT: BbTt: BBtt: Bbtt: bbTT: bbTt: bbtt
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0 :
0
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4 : 8 : 0 : 4 : 0 :0
: 0
Phenotypic Ratio:
Dom/Dom: Dom/Rec: Rec/Dom: Rec/Rec
(First 4:
Next 2:
Next 2:
Last 1)
____12__ : ___4____ : ___0___ : ____0___
2-Factor Punnett Square Notes
1-3
1234
1234
1-4
BbTt x BbTt
2-3
BT
Bt
bT
2-4
bt
BT
BBTT
BBTt
BbTT
BbTt
Bt
BBTt
BBtt
BbTt
Bbtt
bT
BbTT
BbTt
bbTT
bbTt
bt
BbTt
Bbtt
bbTt
bbtt
Answer the following questions using
the Punnett Square:
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a. How many offspring have the genotype, BbTt?
4/16 or 1/4
b. How many offspring have the genotype, bbTt?
2/16 or 1/8
c. How many offspring have the genotype, BBTT?
1/16
d. How many offspring will be Brown-eyed and short?
3/16
e. How many offspring will be Blue-eyed and short?
1/16
f. How many offspring will be Brown-eyed and tall?
9/16